Check the air flow system
of indoor and outdoor units
Clear up the air inlet and outlet or the heat
exchanger of indoor and outdoor units.
Yes
No
Yes
Yes
Power off, then restart the unit 10
minutes later
Check if the temperature
of compressor
No
Check refrigerant system
Yes
Check the overload
protector
Correct the connection.No
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Replace the OLP.
No
Replace the outdoor control PCB.
Yes